Stationary Electrodeless Lamp Using Dielectric Waveguide
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Solution Overview
Problem
Conventional electrodeless discharge lamps require bulb rotation to prevent hot spots, increasing cost and complexity, and existing solutions for mitigating this issue often involve complex microwave systems or toxic additives.
Innovation Solution
A stationary electrodeless discharge lamp design featuring a dielectric rod aligned with the radiofrequency source's output terminal, which acts as a dielectric waveguide to channel microwave energy directly into the bulb, eliminating the need for a resonant cavity and bulb rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If bulb rotation is implemented to prevent hot spots, then temperature distribution is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical rotation system with a dielectric waveguide structure that channels microwave energy to create a stationary plasma discharge with uniform temperature distribution. The waveguide geometry and material properties are designed to distribute RF energy evenly throughout the plasma volume, eliminating the need for mechanical bulb rotation while maintaining uniform heating.
Solution Approach 2:
The dielectric waveguide acts as an intermediary between the magnetron and the plasma discharge. It shapes and directs the microwave energy field to achieve uniform plasma heating without requiring mechanical movement. The waveguide structure mediates the energy transfer from the RF source to the plasma, creating a stationary but uniformly heated discharge.
2Productivity
If resonant cavity and waveguide are added to improve energy transfer, then luminous efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the functions of the resonant cavity and the dielectric waveguide into a single integrated structure. The waveguide itself is designed to serve as the energy transfer medium while also providing the necessary field distribution for efficient plasma heating. This consolidation eliminates the need for separate cavity and waveguide components, reducing device complexity while maintaining luminous efficiency.
Solution Approach 2:
The dielectric waveguide structure performs multiple functions simultaneously: it guides the microwave energy from the magnetron, shapes the electromagnetic field for uniform plasma heating, and acts as a structural support for the bulb assembly. This multi-functionality reduces the overall number of components needed in the system.
3Temperature
If special microwave polarization schemes are used to suppress hot spots, then temperature distribution is improved, but device complexity increases
Solution Approach 1:
The patent achieves uniform temperature distribution by carefully selecting and optimizing the dielectric properties (permittivity, loss tangent) and geometric parameters (dimensions, shape) of the waveguide structure. These parameter changes create a stationary electromagnetic field distribution that uniformly heats the plasma without requiring complex polarization switching or modulation schemes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides reliable and efficient light generation without the need for bulb rotation, reducing costs and complexity while maintaining excellent spectral characteristics and luminous efficiency.
Implementation Method 1
the dielectric rod acts as dielectric waveguide for the radiofrequency field
Implementation Method 2
a radiofrequency source having an output terminal radiating a radiofrequency field for ionizing and heating the composition in the bulb to bring it in a plasma state
Implementation Method 3
a radiofrequency source having an output terminal radiating a radiofrequency field for ionizing and heating the composition in the bulb to bring it in a plasma state
Implementation Method 4
a composition that emits light when in plasma state
Implementation Method 5
a stationary light transmitting bulb filled with a composition that emits light when in plasma state
Data Source
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AI summary
A discharge lamp (20) for providing visible and/or infrared radiation comprising a stationary light transmitting bulb (21) filled with a composition that emits light when in plasma state, a radiofrequency source (41) having an output terminal (44) radiating a radiofrequency field for ionizing and heating the composition in the bulb to bring it in a plasma state (35), and a dielectric rod (22) aligned with the output terminal and positioned between the output terminal (44) and the bulb (21) acting as dielectric waveguide for the radiofrequency field.